I'm using the ThinkPulse active electrodes with the Cyton board, I can see very nice signals from channels of my interest in the OpenBCI GUI (reducing the gain less than 8x). But, when I recorded the

https://openbci.com/forum/index.php?p=/discussion/1481/how-to-become-de-railed

If certain electrodes on the Ultracortex are 'always' railed, it usually means that those electrode holders need to be screwed in closer to the scalp. OR, possibly the connections to those channels ar

Unfortunately, now always electrodes 2(C4), 5(T3), 11(T5) are Railed.

https://openbci.com/forum/index.php?p=/discussion/1481/how-to-become-de-railed

I check the Impedance of channel 15 what means this "RAILED - 0.00 kOhm" ?

What means this message: "Railed 100.00% 3.28 uVrms" or Near Railed or Not Railed

Normally, I start the OpenBCI GUI and then plug in the dongle and turn on the headset to PC. I then start the GUI and start streaming in order to insure that no channels are railed. I have tried usi

From the descriptions you have given, it seems highly likely that your REF (reference) leads, connections, contacts, or gelling on the cap, are insufficient to make a valid quality scalp connection of

Now, when I try to use the EEG, I see "Railed" on every channel and very high values for each channel. I am not sure if it's working at all. It does not look anything like the examples. I ha

With the railed channels, check your impedance, you will find likely those channels are much different than your normal channels.

Thanks for the tip on the railed electrodes too. I will try to fix that. Oddly they did all seem to have contact with my scalp.

I'm not sure I understand your question. When you are using the wrong notch filter, yes the huge 50 Hz component is swamping out the real EEG signal. However with the channel 5 and 6 'railed', that is

If you are seeing 'railed' on channels 5 and 6, it usually means poor contact with scalp. You can check impedance while you are wiggling around the combs on the head. Also see this thread.

I also wondered what 'Railed' and 'Not Railed' means...

For the paste I saw below 5kohm consistently, but for the dry and IDUN it just says railed, or during the short random periods of time when the dry and IDUN electrodes did work on the board, they were

with the dry electrodes have 0 voltage and railed impedance readings. We also tried restarting the app, the computer, and the Cyton board, and it still has the same problem. When I swapped the dry el

2.) Whenever I connected any pin from the Raspberry Pi 400 to the OpenBCI, be it a GND or a GPIO, the EEG waveforms immediately stop giving any meaningful data. The channels go from 'Not Railed' to 'R

...and after the tolerance of often getting railed signal and never get all 8 channel online...

And after the tolerance of often getting railed signal and never get all 8 channel online the ThinkPulse™ Active Electrode just came out and fits my needs. However without AVDD and AVSS I don't know i